SOME NEW SALTS OE CADMIUM. 13 



ON SOME NEW SALTS OE CADMIUM AND THE IODIDES 

 OE BARIUM AND STRONTIUM. 



BY HENET CKOFT, D.C.L. 

 FEOEESSOB OF CHEJIISTET, TTNIYEESITT COLLEGE, TOEONTO. 



Read before the Canadian Institute, January 12th, 1 856. 



Von Hauer has lately taken up the examination of the double 

 chlorides and bromides of cadmium, the existence of which was first 

 noticed by mc in 1842, in a preliminary paper read before the 

 Chemical Society of London. The investigation being interrupted 

 very shortly after its commencement by my removal to Toronto, had 

 never been resumed, and in the short paper laid before the Chemical 

 Society, the formula; had not been fully established, with the exception 

 of that of the sodium compound, viz., Cd CI + Na CI -f 3 Aq, which 

 has since been confirmed by Von Hauer. 



For the two cadmio-chlorides of potassium, the two cadmio-chlorides 

 of ammonium, and the cadmio-bromide of potassium described by me 

 in 1842, Von Hauer proposes the following formulas : — 

 2 K CI + Cd CI K 01 + 2 Cd CI + H 



2 N H* CI + Cd CI N H* CI + 2 Cd CI + H 



2 K Br + Cd Br K Br + 2 Cd Br + II O 



Von Hauer endeavours to establish the existence of three classes 

 of salts, which he denominates chloro-sesquicadmiates, chloro-rnono- 

 cadmiates, and chloro-bicadmiates, represented generally by the 

 following formulae : 2 R CI + Cd CI + X H — R CI + Cd CI + 

 X HO, and R CI + 2 Cd CI + X H ; and in a second paper he 

 states that he has succeeded in preparing a number of double salts 

 with the chlorides of barium, strontium, calcium, magnesium, manga- 

 nese, &c. &c, which seem to support this theory. 



The only examples of the monocadmiates as yet described are the 

 sodium salt (1842) and Von Ilauer's barium compound. 

 Na CI + Cd CI + 3 Aq 

 Ba CI + Cd CI + 4 Aq 



In my former paper I mentioned the existence of a double iodide of 

 cadmium and potassium, for which in an anhydrous state I proposed 

 the formula K I + Cd I. As this, if correct, would place the salt 

 in the class of the iodo-monocadmiates, and as according to Von 

 Hauer these compounds are difficult to obtain, at least with the chlor- 

 ides, I have made a few experiments on the subject of the double 

 iodides and bromides, the results of which are as follows : — 



Cadmio-iodide of Potassium.— -Iodide of cadmium and iodide of 

 potassium were mixed in atomic proportions (equal equivalents) and 



